Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 81,555	$ 9,808
Prepaid expenses and other current assets	2,000	311
Total current assets	83,555	10,119
Property and equipment, net	917	237
Operating lease right-of-use assets	2,529	3,182
Restricted cash	329	329
Deferred offering costs		1,096
Total assets	87,330	14,963
Current liabilities:
Accounts payable	530	1,069
Accrued expenses and other current liabilities	3,214	3,240
Operating lease liabilities	964	899
Total current liabilities	4,708	5,208
Operating lease liabilities, net of current portion	1,708	2,427
Total liabilities	6,416	7,635
Commitments and contingencies (Note 11)
Total redeemable convertible preferred stock		130,666
Stockholders’ equity (deficit):
Common stock, $0.001 par value; 200,000,000 and 275,000,000 shares authorized at September 30, 2020 and December 31, 2019, respectively; 12,924,817 and 230,860 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	13
Additional paid-in capital	223,764	4,419
Accumulated deficit	(142,863)	(127,757)
Total stockholders’ equity (deficit)	80,914	(123,338)
Total liabilities, redeemable convertible preferred stock and stockholders’ equity (deficit)	$ 87,330	14,963
Series A-1 Redeemable Convertible Preferred Stock
Current liabilities:
Total redeemable convertible preferred stock		39,742
Series A-2 Redeemable Convertible Preferred Stock
Current liabilities:
Total redeemable convertible preferred stock		18,393
Series A-3 Redeemable Convertible Preferred Stock
Current liabilities:
Total redeemable convertible preferred stock		38,114
Series A-4 Redeemable Convertible Preferred Stock
Current liabilities:
Total redeemable convertible preferred stock		6,000
Series B Redeemable Convertible Preferred Stock
Current liabilities:
Total redeemable convertible preferred stock		$ 28,417